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Well, i do see 2 sound drivers installed: Soundmax and Creative as you indicate. My guess is Soundmax is your onboard sound card and Creative as an add-on sound card. I wonder which one's sound jacks you're plugged into and which sound card is set as default.

I see Soundmax is your current default. Click Control Panel->Sounds then Audio tab and try changing the sound default as well as which jack input you're connected to

Soundmax would be the driver for the sound chip that comes on the motherboard.

You must have also paid for an add-on expansion sound card for your Dell (i.e. from Creative) it should play sound as well as record.

On the one hand, I would first double check to see which sound jacks you're plugged into. As you might also try the other sound jacks as well as you try switch beween the default sound selection so you can try both. See if this helps you locate which are which

Note you can probably disable the onboard sound card (i.e. Soundmax) in your BIOS settings but not worth doing that till you at least get one or the other to work!